ALV11560 Four wheels on the outer edges/corners provide a natural, no-tip balance- Weight is distributed over the four wheel base for easy pulling with no back strain- The patented fiberglass frames are strong enough to hold an additional 100lbs- on top without losing balance- Exterior is made from durable nylon that is tear and puncture-resistant- Double zipper top opening provides easy access to contents- When in use, remove the puller bar and fold to 3" for compact storage- Bags contain over 30 versatile pockets for storing tools, supplies, and personal effects- These bags also come with two removable storage pouches, two pieces each of removable horizontal and vertical dividers for customizing th 740889041229